Home / Standards / GB 40881-2021 GB 40881-2021 Active Code for security system design of low concentration gas pipeline transportation of coal mine 煤矿低浓度瓦斯管道输送安全保障系统设计规范 Standard Type GB ICS 13.100 CCS D09 Status 现行 Issue Date 2021-10-11 Implementation 2022-05-01 Responsible Dept 国家矿山安监局 Drafting Unit N/A